99772868242 has 4 divisors (see below), whose sum is σ = 149659302366. Its totient is φ = 49886434120.

The previous prime is 99772868197. The next prime is 99772868243. The reversal of 99772868242 is 24286827799.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 52744174921 + 47028693321 = 229661^2 + 216861^2 .

It is a super-5 number, since 5×99772868242⁵ (a number of 56 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (99772868243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24943217059 + ... + 24943217062.

Almost surely, 2^99772868242 is an apocalyptic number.

99772868242 is a deficient number, since it is larger than the sum of its proper divisors (49886434124).

99772868242 is a wasteful number, since it uses less digits than its factorization.

99772868242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49886434123.

The product of its digits is 48771072, while the sum is 64.

The spelling of 99772868242 in words is "ninety-nine billion, seven hundred seventy-two million, eight hundred sixty-eight thousand, two hundred forty-two".